Data preparation for d3 examples

Before building nice vizualisation with it, I analyse and prepare data with jupyter nb.

My d3 visualizations are here : https://bl.ocks.org/rhuille

Name		Name	Last commit message	Last commit date
Latest commit History 36 Commits
Clinton and Trump tweets.ipynb		Clinton and Trump tweets.ipynb
Construction of a Roland Garros dataset.ipynb		Construction of a Roland Garros dataset.ipynb
Forest area by country.ipynb		Forest area by country.ipynb
Population francaise.ipynb		Population francaise.ipynb
README.md		README.md

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